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Yep, if we could mine pure H2 and pure O2 to stick in the rockets, we could put everybody into orbit. Unfortunately, nobody has made a Hydrogen mine yet, so you have to create it yourself, either from water or from hydrocarbon based sources like natural gas. O2 you pretty much have to get from the air. The Hydrocarbon based approach isn't green; and thanks to the pesky laws of thermodynamics you need to put even more energy into creating the H2 and O2 than you get out of it if you're cracking water. All of that energy costs money, lots of money for the quantities involved.
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Jun 28, 2010 20:50
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I can't imagine that the military really gets much from the ticket sales at an airshow. I think it's considered more of a recruiting/advertising expense. Plus, it's where old planes go right before they're to be retired. The Blue Angels will be the first to tell you that they fly the oldest FA-18s in the Navy.
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Jul 24, 2010 20:06
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